Continuum versus line polarization at the center of the Orion nebula

Details Continuum versus line polarization at the center of the Orion nebula Continuum versus line polarization at the center of the Orion nebula

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..322l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 322-332.

Astronomy and Astrophysics

Astrophysics

11

Cosmic Dust, H Beta Line, H Ii Regions, Interstellar Matter, Linear Polarization, Orion Nebula, Light Scattering, Spatial Resolution

Scientific paper

New polarization observations have been performed at the center of the Orion nebula with a 10arcsec spatial resolution, through three filters which allow to study separately the continuum near 5300 Å, Hβ, and the [O III] λ5007 Å. The authors provide for the first time line emission polarization measurements which are free from the contamination by the continuum. Their Hβ measurements make it possible to determine the intensity and polarization of the atomic continuum which can be subtracted from the primary continuum data. Eventually, they get the true percentage of polarization Psca for the scattered continuum. These data have been compared with the theoretical model by White et al. (1980). The observations yield Psca values which are generally 2 to 3 times greater than the computed figures. The measurements reveal a good similarity of the Hβ and the [O III] polarization maps which rules out possible intrinsic effects. The polarization of the scattered [O III] radiation has been investigated with the help of a basic geometrical model. Finally, the polarization of the Trapezium stars has been measured.

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